[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 01/35
ISSUED AT 01/0011Z AUGUST 2001
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

Mildly degraded HF conditions were observed during 
local night hours last night for southern Aus/NZ region. 
In addition, some southern AUS/NZ sites have become mildly 
depressed after local dawn this morning, particularly 
Norfolk Island, Canberra and Chrsitchurch. Christchurch MUFs 
are currently depressed 30%. 

Mild degradation is in association with mild geomagnetic
activity possibly due to coronal hole effects.

Further mild depressions possible after local
dawn tomorrow morning.

Northern region MUFs have remained near normal and
HF communicators in northern region Aus/NZ should
continue to use the monthly T index of 115.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 01-02 AUGUST 2001 FOR SOUTHERN REGION AUS/NZ ONLY.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
01 Aug:  low                  None expected        
02 Aug:  low                  None expected        

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs         2  4  6  8 12 16 22 26
-------------------------------------------------------------
1 Aug   95    -15%           2  4  6  8 12 12 16 22 
2 Aug  115    -15%/normal    2  4  6  8 12 12 16 22 


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